GAME ON Researchers have discovered brain cells in video game-playing macaques that predict another monkey’s next move. Such brain cells may be important in social interactions that require anticipating what others are thinking.

Katie Ris-Vicari/Cell 2015

FAR, FAR AWAY With the help of a new instrument, researchers measured distances to 181 galaxies, seen in this Hubble Space Telescope image, including a few that Hubble missed (highlighted).

R. Bacon/MUSE/ESO

VACUUM ATTRACTION Fleeting electromagnetic waves nudge parallel plates together through a phenomenon called the Casimir effect, illustrated here. If the same thing works with gravitational waves, it could prove the existence of particles that transmit gravity.